Sylvie Willis
Diesel fuel contamination is a common issue for many fuel tank owners. While it is often referred to as diesel algae, the dark sludge that forms in the tank is actually a buildup of microbes, including mould, bacteria, and fungi. This misconception is due to the fact that algae require sunlight to grow, which is not present in closed and dark fuel tanks. The microbes feed on the hydrocarbons in the diesel fuel and produce waste, causing corrosion and engine damage. To prevent and treat this issue, fuel tank owners can employ methods such as using fuel additives, mobile fuel polishing, and regular testing to keep their tanks clean and free of microbial growth.
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What You'll Learn
Diesel fuel contamination
Diesel fuel is a popular choice for powering large vehicles and equipment due to its high energy content and efficiency. However, it is not immune to contamination. Diesel fuel contamination can cause significant performance issues and costly repairs. One of the most common contaminants is microbial growth, often referred to as diesel "algae". This sludge-like substance can clog filters and cause engine damage. The microbes feed on the hydrocarbons in the diesel fuel and produce waste products that can cause corrosion and engine fouling.
Diesel "algae" is not actually algae at all, but rather a buildup of undesirable microbes, including bacteria, mold, and fungus, that get inside the diesel fuel tank and grow into a dark, mucky substance. This substance is called biomass, and it is the technical term for the sludge that may be mistaken for algae. While algae require sunlight for growth, diesel fuel tanks are closed and dark, providing the ideal conditions for microbes to thrive instead.
Water creates favourable conditions for these unwanted microbes, as they live in the water and feed off the hydrocarbons in the diesel fuel. Any openings in the fuel tank, such as the fill port, ventilation, or damage, can provide an easy path for contaminants to enter. Additionally, warmer ambient temperatures can speed up the natural deterioration of diesel fuel and contribute to the growth of microbes. Regular testing and treatment are crucial to keeping your diesel tank free of problems due to microbes and sludge.
There are several warning signs that may indicate a diesel fuel contamination problem:
- An abnormal increase in the rate of filter plugging
- A positive result on a microbe test
- A sudden and unexplained increase in the frequency of filter clogging
- The presence of water in the fuel tank, even as little as a quarter-inch layer at the bottom
To prevent and treat diesel fuel contamination, consider the following:
- Eliminate any one of the three components (air, water, and temperature) that microbes need to grow
- Treat with a diesel additive that removes water from the fuel and frequently drain the water separator
- Implement regular testing and treatment cycles to keep your diesel tank sludge and water-free
- Use fuel additives that eliminate water layers by pulling the water up into the fuel, preventing microbial growth
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Microbial growth
Although often referred to as "diesel algae", the sludge that builds up in diesel fuel tanks is not actually algae, as algae require sunlight to grow, and diesel fuel tanks are dark. Instead, the sludge is caused by microbial growth, including mould, bacteria, and fungi. These microbes feed on the hydrocarbons in the diesel fuel and produce waste products that can cause corrosion and engine fouling. They can also create a slimy film that coats fuel tanks and lines, reducing fuel flow and causing equipment to malfunction.
To prevent microbial growth in diesel fuel tanks, it is important to eliminate one of the three main components that make up the environment in which microbes need to grow: air, water, and temperature. One way to do this is to treat the diesel with an additive that removes water from the fuel and to frequently drain the water from the water separator. Another method is to use a fuel maintenance system, which is a permanent installation that works on a programmed schedule to regularly pull fuel from the tank and filter out contaminants.
If microbial growth has already occurred and sludge has formed in the tank, a mobile fuel polishing service or system can be used to remove the sludge. This involves circulating the fuel out of the tank for filtration to remove both large and small contaminants. However, a single fuel polishing service will not prevent microbial growth indefinitely, and regular testing is necessary to keep the diesel fuel tank sludge and water-free.
Biocides can also be used to kill microbes in diesel fuel tanks. However, they are toxic chemicals that can kill any living thing they come into contact with, and if used too often, they can lead to microbe resistance. Therefore, it is important to only purchase biocides that meet legal requirements and to be aware of the proper usage and potential harm.
In summary, while there may be no single fuel tank that is completely resistant to microbial growth, there are steps that can be taken to prevent and treat it, including the use of fuel additives, fuel maintenance systems, mobile fuel polishing, and biocides. Regular testing and maintenance are key to keeping diesel fuel tanks free of microbial contamination.
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Testing for microbes
While algae cannot grow inside a diesel fuel tank due to the absence of sunlight, microbes such as mould, bacteria, and fungi can contaminate the fuel and cause significant damage. These microbes feed on the hydrocarbons in the diesel fuel and produce waste products that can lead to corrosion, engine fouling, and filter clogging. Therefore, regular testing for microbes is crucial to prevent costly repairs and maintain the optimal performance of diesel-powered vehicles and equipment. Here are some important considerations and methods for testing for microbes in diesel fuel tanks:
Visual Inspection
Although it can be challenging to directly observe microbe growth in a diesel fuel tank, a dark sludge buildup may indicate microbial contamination. This sludge is often referred to as "diesel algae" or "biomass" and is the result of microbial activity. Regular visual inspections of the fuel tank can help identify the presence of this sludge, prompting further testing and remediation.
Filter Monitoring
Microbes can accelerate the degradation of diesel fuel, causing it to lose storage quality. Consequently, fuel filters may become clogged more frequently due to the presence of microbial bodies and the slimy biomass they produce. Keeping a close eye on fuel filters and tracking their replacement rate can provide valuable insights into potential microbe issues. An abnormal increase in filter plugging rate is a warning sign that warrants further investigation and testing for microbes.
Water Presence
Water creates favourable conditions for microbial growth in diesel fuel tanks. Even a small amount of water at the bottom of the tank can provide enough moisture for microbes to thrive. Regularly checking for water accumulation through methods such as fuel tank sticking can help identify potential breeding grounds for microbes. If a significant depth of water is detected, further testing and remedial actions should be undertaken.
Microbe Testing
There are various in-field microbe tests available to confirm the presence of microbes in diesel fuel. Among these tests, the ATP test is recommended as it offers higher accuracy compared to culture tests, which are prone to false positives and negatives. By regularly conducting microbe tests, early detection of microbial contamination is possible, enabling prompt action to prevent extensive damage.
Fuel Polishing
While not solely a testing method, fuel polishing can be employed to address microbial contamination. Mobile fuel polishing systems circulate the fuel out of the tank for filtration, effectively removing contaminants and preventing future microbial growth by eliminating water. However, it is important to note that a single fuel polishing service may not provide long-term protection against microbes, and regular testing should still be conducted post-treatment.
In summary, testing for microbes in diesel fuel tanks is essential to prevent engine damage, maintain fuel quality, and ensure the optimal performance of diesel-powered equipment. By utilising visual inspections, monitoring fuel filters, checking for water presence, conducting microbe tests, and considering fuel polishing, diesel tank owners can proactively manage microbial contamination and mitigate the adverse effects of these unwanted organisms.
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Removing water
While algae cannot grow in diesel fuel tanks due to the lack of sunlight, microbes such as bacteria, mould, and fungi can. These microbes feed on the hydrocarbons in the diesel fuel and produce waste products that can cause corrosion and engine fouling. They can also create a slimy film that coats fuel tanks and lines, reducing fuel flow and causing equipment to malfunction.
Water is one of the key components that allow microbes to grow in diesel fuel tanks. Even a small amount of water at the bottom of a fuel tank is enough for microbes to grow and thrive. Therefore, removing water from diesel fuel tanks is crucial for preventing microbial growth.
One way to remove water from a diesel fuel tank is to use a fuel additive that eliminates water by pulling it up into the fuel. This action prevents the formation of distinct layers of water and fuel, disrupting the environment needed for microbial growth. However, it is important to not overuse additives as this can create more problems.
Another method for removing water and addressing microbial growth is mobile fuel polishing. This process involves circulating the fuel out of the tank for filtration, effectively removing both large and small contaminants. While a single fuel polishing service may not prevent future microbial growth, it helps to address the immediate issue of water and sludge in the tank.
For Tier-4 engines, automated fuel maintenance systems are recommended. These systems are permanent installations that work on a programmed schedule to regularly pull fuel from the tank and filter out contaminants, including water. This proactive approach ensures that water is regularly removed from the fuel, reducing the risk of microbial growth.
In summary, removing water from diesel fuel tanks is essential for preventing microbial growth and maintaining engine performance. By employing methods such as fuel additives, mobile fuel polishing, and automated fuel maintenance systems, water can be effectively eliminated, creating an unfavourable environment for microbes to thrive.
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Treatment methods
Although algae cannot grow inside a diesel fuel tank due to the absence of sunlight, microbes such as mould, bacteria, and fungus can contaminate the fuel and cause significant damage. This contamination is often referred to as "diesel algae" or "diesel fuel slime". Here are some treatment methods to address and prevent this issue:
Testing and Monitoring
Regular testing and monitoring of diesel fuel tanks are crucial to detect microbial contamination early on. Look for warning signs such as a significant depth of water at the bottom of the tank, an abnormal increase in filter plugging rate, or the presence of dark sludge. Conducting microbe tests, such as ATP tests, can provide accurate results and help identify potential issues.
Water Removal and Tank Cleaning
If contamination is suspected or confirmed, the first step is to remove water from the fuel tank. Water provides favourable conditions for microbes to grow and thrive. By eliminating water, you disrupt their habitat and hinder their growth. After removing water, thoroughly clean the tank to get rid of any sludge or biomass formed by microbial activity.
Fuel Additives
Using fuel additives is an effective way to address diesel algae. Additives help remove water from the fuel by pulling it up, eliminating the layers. This action prevents the formation of distinct layers and inhibits microbial growth. However, be cautious not to overuse additives, as too much can create additional problems.
Biocides
Biocides are toxic chemicals that can be used to kill microbes in diesel fuel. They are typically effective in removing diesel algae, but they should be used with caution. Biocides can be harmful to other living things they come into contact with, so it's important to follow safety warnings and instructions for proper usage. Additionally, frequent use of biocides can lead to the development of microbe resistance, rendering them ineffective over time.
Fuel Polishing
Mobile fuel polishing services or systems can be employed to remove sludge and contaminants from diesel fuel. These systems circulate the fuel out of the tank for filtration, effectively removing both large and small particles. While fuel polishing is an effective treatment method, it may not prevent microbial growth indefinitely, and regular testing and treatment cycles are still necessary.
Preventative Measures
The best approach to dealing with diesel algae is prevention. Eliminating any one of the three key components required for microbial growth—air, water, and temperature—can prevent the problem altogether. Keep your fuel tanks clean, dry, and well-maintained to create an unfavourable environment for microbes. Regularly drain water from your water separator and implement automated fuel maintenance systems, especially for Tier-4 engines, to proactively prevent microbial growth.
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Frequently asked questions
Algae in a fuel tank is a buildup of undesirable microbes that require testing, treatment, and prevention.
There are some simple ways to tell if you have algae growing in your tank. You can keep an eye on your fuel filters and track how often you need to replace them. You can also run tests on your diesel fuel tank regularly.
The best algae treatment is prevention. Eliminating any one of the three main components that make up the environment algae need to grow (air, water, and temperature) will prevent the microbes from growing.
You can treat your fuel tank with a diesel additive that removes water from the fuel and frequently drain the water from your water separator. You can also use biocides to kill the algae, but they can be toxic and create microbe-resistant strains.
Fuel tanks that are regularly maintained and kept free of water and sludge are more resistant to algae. Automated fuel maintenance systems can be installed to regularly pull fuel from the tank and filter out contaminants.
